Implement github and linkedin links on profile

[jonasdeluna]

Implemented github and linkedin fields on user.

Blocking: https://github.com/webkom/lego-webapp/pull/3901

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (3c95733) 88.16% compared to head (4a79372) 88.16%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3481 +/- ## ======================================= Coverage 88.16% 88.16% ======================================= Files 663 664 +1 Lines 20938 20946 +8 ======================================= + Hits 18459 18467 +8 Misses 2479 2479 ``` | [Files Changed](https://app.codecov.io/gh/webkom/lego/pull/3481?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom) | Coverage Δ | | |---|---|---| | [lego/apps/users/serializers/users.py](https://app.codecov.io/gh/webkom/lego/pull/3481?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom#diff-bGVnby9hcHBzL3VzZXJzL3NlcmlhbGl6ZXJzL3VzZXJzLnB5) | `95.37% <ø> (ø)` | | | [...041\_user\_linkedin\_id\_alter\_user\_github\_username.py](https://app.codecov.io/gh/webkom/lego/pull/3481?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom#diff-bGVnby9hcHBzL3VzZXJzL21pZ3JhdGlvbnMvMDA0MV91c2VyX2xpbmtlZGluX2lkX2FsdGVyX3VzZXJfZ2l0aHViX3VzZXJuYW1lLnB5) | `100.00% <100.00%> (ø)` | | | [lego/apps/users/models.py](https://app.codecov.io/gh/webkom/lego/pull/3481?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom#diff-bGVnby9hcHBzL3VzZXJzL21vZGVscy5weQ==) | `95.01% <100.00%> (+0.01%)` | :arrow_up: | | [lego/apps/users/validators.py](https://app.codecov.io/gh/webkom/lego/pull/3481?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom#diff-bGVnby9hcHBzL3VzZXJzL3ZhbGlkYXRvcnMucHk=) | `96.29% <100.00%> (+0.14%)` | :arrow_up: |

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